and Ableton Live during live shows as well, I believe. I get the feeling he's expanded a bit more now that it's not so much just samples.

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I, myself, use a demo version of Ableton Live for editing and layering all the tracks (as well as, nowadays, a Tascam eight-track); with something like Audacity and Goldwave for additional editing and tinkering (nowadays, I do this mainly through hardware, too, though).

There's loads of possibilities though to use a computer in a way that you feel comfortable with; but I definitely recommend checking out those programs.

it's more that I'd started making music exclusively using those to layer everything (which limits you quite a bit), so I just kept using them for editing loops and for effects and stuff when I got the Ableton (also partly cause my lite version of Ableton only allows there to be two or three effects banks, and eight audio/MIDI tracks open at one time, so this was a handy workaround to some of the problems that came up)